Uplink codeword to layer mapping and phase tracking reference signaling

Abstract

The present application relates to devices and components including apparatus. systems, and methods for mapping codewords to transmission layers and transmitting phase tracking reference signals in wireless networks.

What is claimed is: 
     
         1 . One or more non-transitory, computer-readable media having instructions that, when executed, cause processing circuitry to:
 determine a plurality of phase-tracking reference signal (PTRS) ports are configured;   identify one or more codewords that are respectively associated with one or more modulation and coding schemes (MCSs);   map the plurality of PTRS ports to the one or more codewords;   determine, based on at least one MCS of the one or more MCSs, one or more densities for the plurality of PTRS ports; and   provide PTRSs on the plurality of PTRS ports based on the one or more densities.   
     
     
         2 . The one or more non-transitory, computer-readable media of  claim 1 , wherein the at least one MCS includes a first MCS and the instructions, when executed, further cause the processing circuitry to:
 map a first PTRS port of the plurality of PTRS ports to a first codeword that is associated with the first MCS; and   determine a first density for the first PTRS port based on the first MCS.   
     
     
         3 . The one or more non-transitory, computer-readable media of  claim 1 , wherein the at least one MCS includes a first MCS and the instructions, when executed, further cause the processing circuitry to:
 determine a common density for the plurality of PTRS ports,   wherein the common density is based on the first MCS and the first MCS is a highest MCS of the one or more MCSs.   
     
     
         4 . The one or more non-transitory, computer-readable media of  claim 1 , wherein the instructions, when executed, further cause the processing circuitry to:
 calculate a spectrum efficiency for a physical uplink shared channel (PUSCH) transmission based on the one or more MCSs;   select an equivalent MCS based on the spectrum efficiency; and   determine a common density for the plurality of PTRS ports, based on the equivalent MCS.   
     
     
         5 . The one or more non-transitory, computer-readable media of  claim 1 , wherein the instructions, when executed, further cause the processing circuitry to:
 determine a first PTRS is mapped to a first codeword;   determine at least two layers are mapped to the first codeword; and   associate the first PTRS with one demodulation reference signal (DMRS) port, the one DMRS port associated with one of the at least two layers.   
     
     
         6 . The one or more non-transitory, computer-readable media of  claim 1 , wherein a first PTRS port of the plurality of PTRS ports is mapped to at least two codewords, the at least two codewords respectively associated with at least two MCSs, and the instructions, when executed, further cause the processing circuitry to:
 determine a first density for the first PTRS port based on a highest MCS of the at least two MCSs, a lowest MCS of the at least two MCSs, or an equivalent MCS that is calculated based on the at least two MCSs.   
     
     
         7 . The one or more non-transitory, computer-readable media of  claim 1 , wherein the at least one MCS includes a first MCS, first and second PTRS ports of the plurality of PTRS ports are mapped to a first codeword of the one or more codewords, the first codeword is associated with the first MCS, and the instructions, when executed, further cause the processing circuitry to:
 determine a density for the first and second PTRS ports based on the first MCS.   
     
     
         8 . The one or more non-transitory, computer-readable media of  claim 1 , wherein the one or more codewords has M codewords, where M is a first integer, the plurality of PTRS ports has N PTRS ports, where N is a second integer that is greater than or equal to the first integer, and the instructions, when executed, further cause the processing circuitry to:
 determine a common density for the N PTRS ports based on a highest MCS associated with the M codewords.   
     
     
         9 . The one or more non-transitory, computer-readable media of  claim 1 , wherein a first PTRS port of the plurality of PTRS ports is mapped to first and second codewords, the first codeword to be transmitted on one or more first transmission layers with a first MCS, the second codeword to be transmitted on one or more second transmission layers with a second MCS, and the instructions, when executed, further cause the processing circuitry to:
 receive an associated layer index in downlink control information; and   associate the first PTRS port with one transmission layer selected from the one or more first transmission layers and the one or more second transmission layers based on the associated layer index.   
     
     
         10 . The one or more non-transitory, computer-readable media of  claim 9 , wherein the instructions, when executed, further cause the processing circuitry to:
 determine the second MCS is higher than the first MCS; and   select, based on determination that the second MCS is higher than the first MCS, the one transmission layer from the one or more second transmission layers.   
     
     
         11 . The one or more non-transitory, computer-readable media of  claim 9 , wherein the instructions, when executed, further cause the processing circuitry to:
 determine the second MCS is the same as the first MCS; and   select, based on determination that the second MCS is the same as the first MCS, a transmission layer of the one or more first transmission layers and the one or more second transmission layers having a lowest index as the one transmission layer.   
     
     
         12 . An apparatus comprising:
 processing circuitry to:   determine a plurality of phase-tracking reference signal (PTRS) ports are configured;   identify one or more codewords that are respectively associated with one or more modulation and coding schemes (MCSs);   map the plurality of PTRS ports to the one or more codewords;   determine, based on at least one MCS of the one or more MCSs, one or more densities for the plurality of PTRS ports; and   provide PTRSs on the plurality of PTRS ports based on the one or more densities; and   interface circuitry to communicatively couple the processing circuit to a component.   
     
     
         13 . The apparatus of  claim 12 , wherein the at least one MCS includes a first MCS and the processing circuitry is further to:
 determining a common density for the plurality of PTRS ports,   wherein the common density is based on the first MCS and the first MCS is a highest MCS of the one or more MCSs.   
     
     
         14 . The apparatus of  claim 12 , wherein the at least one MCS includes a first MCS, first and second PTRS ports of the plurality of PTRS ports are mapped to a first codeword of the one or more codewords, the first codeword associated with a first MCS, and the processing circuitry is further to:
 determine a density for the first and second PTRS ports based on the first MCS.   
     
     
         15 . The apparatus of  claim 12 , wherein the one or more codewords has M codewords, where M is a first integer, the plurality of PTRS ports has N PTRS ports, where N is a second integer that is greater than or equal to the first integer, and the processing circuitry is further to:
 determine a common density for the N PTRS ports based on a highest MCS associated with the M codewords.   
     
     
         16 . The apparatus of  claim 12 , wherein a first PTRS port of the plurality of PTRS ports is mapped to first and second codewords, the first codeword to be transmitted on one or more first transmission layers with a first MCS, the second codeword to be transmitted on one or more second transmission layers with a second MCS, and the processing circuitry is further to:
 receive an associated layer index in downlink control information; and   associate the first PTRS port with one transmission layer selected from the one or more first transmission layers and the one or more second transmission layers based on the associated layer index.   
     
     
         17 . The apparatus of  claim 16 , wherein the processing circuitry is further to:
 determine the second MCS is higher than the first MCS; and   select, based on determination that the second MCS is higher than the first MCS, the one transmission layer from the one or more second transmission layers.   
     
     
         18 . The apparatus of  claim 16 , wherein the processing circuitry is further to:
 determine the second MCS is the same as the first MCS; and   select, based on determination that the second MCS is the same as the first MCS, a transmission layer of the one or more first transmission layers and the one or more second transmission layers having a lowest index as the one transmission layer.   
     
     
         19 . A method comprising:
 configuring a user equipment (UE) for transmission using a plurality of phase-tracking reference signal (PTRS) ports;   scheduling one or more codewords that are respectively associated with one or more modulation and coding schemes (MCSs), wherein the plurality of PTRS ports are mapped to the one or more codewords;   determining, based on at least one MCS of the one or more MCSs, one or more densities for the plurality of PTRS ports; and   processing PTRSs transmitted using the plurality of PTRS ports based on the one or more densities.   
     
     
         20 . The method of  claim 19 , wherein the at least one MCS includes a first MCS and the method further comprises:
 determining a common density for the plurality of PTRS ports,   wherein the common density is based on the first MCS and the first MCS is a highest MCS of the one or more MCSs.